Usage History of 'keratinous'

The following chart shows how frequently 'keratinous' appeared in printed materials over time. For example, the word 'keratinous' occurred 2 times in books in 1875 and 446 times in 2008. From 1875 to 2008, the word 'keratinous' was used a total of 21,216 times in books scanned by Google. See Reference: Google Ngram project.

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